<xqdoc:description>Get or generate thumbnails from the given database collection $a$b point to a location where the thumbnails should be created, $b can be a local path, with the prefix 'xmldb:' a absolute path within the database or with 'rel:' path relative to the given collection at $a.You can leave $b empty then the default is 'rel:/thumbs'. $c specifies the dimension of the thumbnails, if empty then the default values are 'maxheight = 100' and 'maxwidth = 100', the first value of $c is 'maxheight' and the second 'maxwidth'. $d is the prefix (if any) for the thumbnails</xqdoc:description>
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